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Marine biology > cnidarians & ctenophoras > Flashcards

cnidarians & ctenophoras Flashcards

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1
Q

what are most cnidarias

A

marine

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2
Q

hydras are found in

A

freshwater

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3
Q

outer ?

inner ?

A

epidermis

gastro dermis

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4
Q

tentacles surround what?

A

the mouth

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5
Q

stinging cells are found where?

A

tentacles

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6
Q

cnidocytes contain poison to

A

paralyze prey

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7
Q

secretes digestive juices into gastro vascular cavity

A

inner gastro dermis

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8
Q

digests food and circulates nutrients

A

gastro vascular cavity

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9
Q

food is digested outside of cells

A

extracellular digestion

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10
Q

help in directional movement and capturing prey

A

muscles

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11
Q

scyphozoans ex

A

jellyfish

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12
Q

anthozoans ex

A

sea anemones, corals

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13
Q

hydrazoan ex

A

hydra

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14
Q

cubozoa ex

A

box jellies

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15
Q

jellyfish’s dominant body form

A

medusa

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16
Q

most corals are

A

Colonial

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17
Q

? live inside the coral, providing food and help to eleminate waste through photosynthesis

A

algae

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18
Q

corals grow best where ?

A

tropical, well lit, clear water

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19
Q

when corals become colorless

A

coral bleaching

20
Q

hydras reproduce by

A

budding

21
Q

hydras live in

A

freshwater

22
Q

how many species of Ctenophoran are there

A

100

23
Q

what type of symmetry do Ctenophorans have

A

radial

24
Q

how many species of phylum Cnidaria are there?

A

9,000

25
Q

stinging capsule

A

nematocysts

26
Q

what type of skeleton do cinidarians have

A

hydrostatic

27
Q

a gelatinous or jellylike layer between the epidermis and gastro dermis

A

mesoglea

28
Q

how do hydra and sea anemone move about on the sea floor

A

by gliding on their basal discs

29
Q

digestion that occurs in cnidarias

A

extracellular

30
Q

free-swimming larva

A

planula

31
Q

true jellyfish class

A

scyphozoa

32
Q

dominant body form of true jellyfish

A

medusae

33
Q

what does dioecious mean

A

seperate sexes

34
Q

juvenile medusae in the series of buds

A

strobila

35
Q

break loose and grow into mature sexual medusae

A

ephyrae

36
Q

what does the sea anemone feed on

A

fish or anything of suitable size

37
Q

what type of symbiotic relationship does the sea anymore have with clown fish, anemone, and hermit crabs

A

mutualistic

38
Q

how did Ctenophoras get their name

A

it’s 8 rows of ciliated plates

39
Q

sticky substance that is used in prey capture

A

colloblasts

40
Q

4 classes of the phylum Cnidaria

A

Hydrozoa
scyphozoa
cubozoa
authozoa

40
Q

2 basic body forms or styles of cnidarias

A

medusa

polyp

40
Q

gastro vascular cavity

A

coelenteron

40
Q

polyp body form
structure:
tentacles location:
mouth location:

A

tubular
around the mouth
at the end of the body

40
Q

medusa body form
structure:
tentacles location:
mouth location:

A

umbrella
extend from rim of umbrella
centered on the concave side

40
Q

trigger like structure of the cnidocyte

A

cnidocil

40
Q

the primitive nervous system of cinidarians

A

nerve net

40
Q

extension that contains the mouth

A

manubrium

Marine biology (2 decks)

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